[MIPS] Fix and cleanup the mess that a dozen prom_printf variants are.

early_printk is a so much saner thing.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -176,7 +176,7 @@ config MACH_DECSTATION
 	bool "DECstations"
 	select BOOT_ELF32
 	select DMA_NONCOHERENT
-	select EARLY_PRINTK
+	select SYS_HAS_EARLY_PRINTK
 	select IRQ_CPU
 	select SYS_HAS_CPU_R3000
 	select SYS_HAS_CPU_R4X00
@@ -242,6 +242,7 @@ config MACH_JAZZ
 config LASAT
 	bool "LASAT Networks platforms"
 	select DMA_NONCOHERENT
+	select SYS_HAS_EARLY_PRINTK
 	select HW_HAS_PCI
 	select MIPS_GT64120
 	select MIPS_NILE4
@@ -256,6 +257,7 @@ config MIPS_ATLAS
 	bool "MIPS Atlas board"
 	select BOOT_ELF32
 	select DMA_NONCOHERENT
+	select SYS_HAS_EARLY_PRINTK
 	select IRQ_CPU
 	select HW_HAS_PCI
 	select MIPS_BOARDS_GEN
@@ -301,6 +303,7 @@ config MIPS_MALTA
 	select SYS_HAS_CPU_MIPS64_R1
 	select SYS_HAS_CPU_NEVADA
 	select SYS_HAS_CPU_RM7000
+	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -316,6 +319,7 @@ config MIPS_SEAD
 	depends on EXPERIMENTAL
 	select IRQ_CPU
 	select DMA_NONCOHERENT
+	select SYS_HAS_EARLY_PRINTK
 	select MIPS_BOARDS_GEN
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_HAS_CPU_MIPS32_R2
@@ -353,9 +357,11 @@ config WR_PPMC
 config MIPS_SIM
 	bool 'MIPS simulator (MIPSsim)'
 	select DMA_NONCOHERENT
+	select SYS_HAS_EARLY_PRINTK
 	select IRQ_CPU
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_HAS_CPU_MIPS32_R2
+	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
 	select SYS_SUPPORTS_LITTLE_ENDIAN
@@ -376,6 +382,7 @@ config MOMENCO_JAGUAR_ATX
 	select RM7000_CPU_SCACHE
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_RM9000
+	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -513,6 +520,7 @@ config PMC_YOSEMITE
 	select IRQ_CPU_RM9K
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_RM9000
+	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -573,6 +581,7 @@ config SGI_IP22
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_R4X00
 	select SYS_HAS_CPU_R5000
+	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -587,7 +596,7 @@ config SGI_IP27
 	select ARC64
 	select BOOT_ELF64
 	select DMA_IP27
-	select EARLY_PRINTK
+	select SYS_HAS_EARLY_PRINTK
 	select HW_HAS_PCI
 	select NR_CPUS_DEFAULT_64
 	select PCI_DOMAINS
@@ -749,6 +758,7 @@ config SNI_RM
 	select SYS_HAS_CPU_R5000
 	select SYS_HAS_CPU_R10000
 	select R5000_CPU_SCACHE
+	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL if EXPERIMENTAL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -897,6 +907,20 @@ config DMA_NEED_PCI_MAP_STATE
 	bool
 
 config EARLY_PRINTK
+	bool "Early printk" if EMBEDDED && DEBUG_KERNEL
+	depends on SYS_HAS_EARLY_PRINTK
+	default y
+	help
+	  This option enables special console drivers which allow the kernel
+	  to print messages very early in the bootup process.
+
+	  This is useful for kernel debugging when your machine crashes very
+	  early before the console code is initialized. For normal operation
+	  it is not recommended because it looks on some machines ugly and
+	  oesn't cooperate with an X server. You should normally N here,
+	  unless you want to debug such a crash.
+
+config SYS_HAS_EARLY_PRINTK
 	bool
 
 config GENERIC_ISA_DMA
@@ -1033,6 +1057,7 @@ config SOC_PNX8550
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select SYS_HAS_CPU_MIPS32_R1
+	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select GENERIC_HARDIRQS_NO__DO_IRQ
 	select SYS_SUPPORTS_KGDB
@@ -1093,7 +1118,7 @@ config HAVE_STD_PC_SERIAL_PORT
 
 config ARC_CONSOLE
 	bool "ARC console support"
-	depends on SGI_IP22 || SNI_RM
+	depends on SGI_IP22 || (SNI_RM && CPU_LITTLE_ENDIAN)
 
 config ARC_MEMORY
 	bool

arch/mips/arc/console.c

@@ -29,35 +29,3 @@ void prom_putchar(char c)
 	ArcWrite(1, &it, 1, &cnt);
 	bc_enable();
 }
-
-char prom_getchar(void)
-{
-	ULONG cnt;
-	CHAR c;
-
-	bc_disable();
-	ArcRead(0, &c, 1, &cnt);
-	bc_enable();
-
-	return c;
-}
-
-void prom_printf(char *fmt, ...)
-{
-	va_list args;
-	char ppbuf[1024];
-	char *bptr;
-
-	va_start(args, fmt);
-	vsprintf(ppbuf, fmt, args);
-
-	bptr = ppbuf;
-
-	while (*bptr != 0) {
-		if (*bptr == '\n')
-			prom_putchar('\r');
-
-		prom_putchar(*bptr++);
-	}
-	va_end(args);
-}

arch/mips/arc/init.c

@@ -24,12 +24,15 @@ void __init prom_init(void)
 {
 	PSYSTEM_PARAMETER_BLOCK pb = PROMBLOCK;
 	romvec = ROMVECTOR;
+	ULONG cnt;
+	CHAR c;
+
 	prom_argc = fw_arg0;
 	_prom_argv = (LONG *) fw_arg1;
 	_prom_envp = (LONG *) fw_arg2;
 
 	if (pb->magic != 0x53435241) {
-		prom_printf("Aieee, bad prom vector magic %08lx\n", pb->magic);
+		printk(KERN_CRIT "Aieee, bad prom vector magic %08lx\n", pb->magic);
 		while(1)
 			;
 	}
@@ -41,8 +44,8 @@ void __init prom_init(void)
 	prom_meminit();
 
 #ifdef DEBUG_PROM_INIT
-	prom_printf("Press a key to reboot\n");
-	prom_getchar();
+	pr_info("Press a key to reboot\n");
+	ArcRead(0, &c, 1, &cnt);
 	ArcEnterInteractiveMode();
 #endif
 }

arch/mips/arc/memory.c

@@ -118,11 +118,11 @@ void __init prom_meminit(void)
 #ifdef DEBUG
 	int i = 0;
 
-	prom_printf("ARCS MEMORY DESCRIPTOR dump:\n");
+	printk("ARCS MEMORY DESCRIPTOR dump:\n");
 	p = ArcGetMemoryDescriptor(PROM_NULL_MDESC);
 	while(p) {
-		prom_printf("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
-			    i, p, p->base, p->pages, mtypes(p->type));
+		printk("[%d,%p]: base<%08lx> pages<%08lx> type<%s>\n",
+		       i, p, p->base, p->pages, mtypes(p->type));
 		p = ArcGetMemoryDescriptor(p);
 		i++;
 	}

arch/mips/arc/tree.c

@@ -93,11 +93,11 @@ static char *iflags[] = {
 static void __init
 dump_component(pcomponent *p)
 {
-	prom_printf("[%p]:class<%s>type<%s>flags<%s>ver<%d>rev<%d>",
-		    p, classes[p->class], types[p->type],
-		    iflags[p->iflags], p->vers, p->rev);
-	prom_printf("key<%08lx>\n\tamask<%08lx>cdsize<%d>ilen<%d>iname<%s>\n",
-		    p->key, p->amask, (int)p->cdsize, (int)p->ilen, p->iname);
+	printk("[%p]:class<%s>type<%s>flags<%s>ver<%d>rev<%d>",
+	       p, classes[p->class], types[p->type],
+	       iflags[p->iflags], p->vers, p->rev);
+	printk("key<%08lx>\n\tamask<%08lx>cdsize<%d>ilen<%d>iname<%s>\n",
+	       p->key, p->amask, (int)p->cdsize, (int)p->ilen, p->iname);
 }
 
 static void __init

arch/mips/cobalt/console.c

@@ -19,29 +19,3 @@ static void putchar(int c)
 
 	COBALT_UART[UART_TX] = c;
 }
-
-static void cons_write(struct console *c, const char *s, unsigned n)
-{
-	while(n-- && *s)
-		putchar(*s++);
-}
-
-static struct console cons_info =
-{
-	.name	= "uart",
-	.write	= cons_write,
-	.flags	= CON_PRINTBUFFER | CON_BOOT,
-	.index	= -1,
-};
-
-void __init cobalt_early_console(void)
-{
-	register_console(&cons_info);
-
-	printk("Cobalt: early console registered\n");
-}
-
-void __init disable_early_printk(void)
-{
-	unregister_console(&cons_info);
-}

arch/mips/cobalt/setup.c

@@ -150,10 +150,6 @@ void __init plat_mem_setup(void)
 #endif
 
 	if (cobalt_board_id > COBALT_BRD_ID_RAQ1) {
-#ifdef CONFIG_EARLY_PRINTK
-		cobalt_early_console();
-#endif
-
 #ifdef CONFIG_SERIAL_8250
 		uart.line	= 0;
 		uart.type	= PORT_UNKNOWN;

arch/mips/dec/prom/console.c

@@ -16,40 +16,12 @@
 
 #include <asm/dec/prom.h>
 
-static void __init prom_console_write(struct console *con, const char *s,
-				      unsigned int c)
+void prom_putchar(char c)
 {
-	static char sfmt[] __initdata = "%%%us";
-	char fmt[13];
+	char s[2];
 
-	snprintf(fmt, sizeof(fmt), sfmt, c);
-	prom_printf(fmt, s);
-}
-
-static struct console promcons __initdata = {
-	.name	= "prom",
-	.write	= prom_console_write,
-	.flags	= CON_PRINTBUFFER,
-	.index	= -1,
-};
-
-static int promcons_output __initdata = 0;
-
-void __init register_prom_console(void)
-{
-	if (!promcons_output) {
-		promcons_output = 1;
-		register_console(&promcons);
-	}
-}
+	s[0] = c;
+	s[1] = '\0';
 
-void __init unregister_prom_console(void)
-{
-	if (promcons_output) {
-		unregister_console(&promcons);
-		promcons_output = 0;
-	}
+	prom_printf( s);
 }
-
-void disable_early_printk(void)
-	__attribute__((alias("unregister_prom_console")));

arch/mips/gt64120/ev64120/promcon.c

@@ -24,11 +24,6 @@ static void prom_console_write(struct console *co, const char *s,
 	}
 }
 
-int prom_getchar(void)
-{
-	return 0;
-}
-
 static struct console sercons = {
     .name	= "ttyS",
     .write	= prom_console_write,

arch/mips/kernel/Makefile

@@ -65,5 +65,6 @@ obj-$(CONFIG_64BIT)		+= cpu-bugs64.o
 obj-$(CONFIG_I8253)		+= i8253.o
 
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o
+obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 
 CFLAGS_cpu-bugs64.o	= $(shell if $(CC) $(CFLAGS) -Wa,-mdaddi -c -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-DHAVE_AS_SET_DADDI"; fi)

arch/mips/kernel/early_printk.c

@@ -0,0 +1,40 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2002, 2003, 06, 07 Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2007 MIPS Technologies, Inc.
+ *   written by Ralf Baechle (ralf@linux-mips.org)
+ */
+#include <linux/console.h>
+#include <linux/init.h>
+
+extern void prom_putchar(char);
+
+static void early_console_write(struct console *con, const char *s, unsigned n)
+{
+	while (n-- && *s) {
+		if (*s == '\n')
+			prom_putchar('\r');
+		prom_putchar(*s);
+		s++;
+	}
+}
+
+static struct console early_console = {
+	.name	= "early",
+	.write	= early_console_write,
+	.flags	= CON_PRINTBUFFER | CON_BOOT,
+	.index	= -1
+};
+
+void __init setup_early_printk(void)
+{
+	register_console(&early_console);
+}
+
+void __init disable_early_printk(void)
+{
+	unregister_console(&early_console);
+}

arch/mips/kernel/setup.c

@@ -525,6 +525,14 @@ void __init setup_arch(char **cmdline_p)
 {
 	cpu_probe();
 	prom_init();
+
+#ifdef CONFIG_EARLY_PRINTK
+	{
+		extern void setup_early_printk(void);
+
+		setup_early_printk();
+	}
+#endif
 	cpu_report();
 
 #if defined(CONFIG_VT)